#3A427F
Closest named color: Dark Slate Blue (#483D8B). oklch(40.4% 0.102 275.3), rgb(58, 66, 127).
Aa
White text reads best on this color (9.26:1).
About this color
#3A427F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.102 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.033 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #3A427F |
| RGB | rgb(58, 66, 127) |
| HSL | hsl(233, 37%, 36%) |
| OKLCH | oklch(40.4% 0.102 275.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #3A427F | 9.26:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3A427F | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #3A427F text on white | 9.26:1 | AAA | Lc 91.2 | Preferred for body text |
| #3A427F text on black | 2.26:1 | Fails | Lc -11.1 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D2D8F0
oklch(88.5% 0.034 274.5)
-
Step 300
300
#B5BEE8
oklch(80.9% 0.06 275.5)
-
Step 400
400
#8F9CDC
oklch(70.7% 0.095 274.9)
-
Step 500
500
#7582D2
oklch(63.1% 0.121 275.4)
-
Step 600
600
#5E6AC0
oklch(55.6% 0.133 275.2)
-
Step 700
700
#4E58A5
oklch(49.1% 0.123 275.4)
-
Step 800
800 (this color)
#3A427F
oklch(40.4% 0.102 275.3)
-
Step 900
900
#363D6B
oklch(37.7% 0.079 275.4)
-
Step 950
950
#1F243F
oklch(27% 0.051 274.5)
#3A427F with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #274A81 | 0.030 |
| Deuteranopia (no green cones) | #1F447E | 0.032 |
| Tritanopia (no blue cones) | #1B4F5A | 0.090 |
| Achromatopsia (no color) | #474747 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A427F
#3A427F
oklch(40.4% 0.102 275.3)
- #574800
#574800
oklch(40.5% 0.083 95.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #3A427F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.033
- Cobalt #1E488F ΔE 0.040
- Blueberry #464196 ΔE 0.043
- Twilight Blue #0A437A ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Dusk Blue #26538D ΔE 0.051
- Twilight #4E518B ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.062
Use #3A427F in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.